import unittest
from test04_tools import add


class TestAdd(unittest.TestCase):
    def test_1(self):
        self.assertEqual(1, add(1, 0))

    def test_2(self):
        self.assertEqual(4, add(1, 3))

    def test_3(self):
        self.assertEqual(5, add(1, 4))

    def test_4(self):
        self.assertEqual(9, add(4, 5))
